PIC18F442T-I/PT - 8-bit MCU, 16KB Flash, 44-TQFP | Microchip
MPN: PIC18F442T-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.45 | $8.45 |
| 10 | $7.61 | $76.10 |
| 100 | $6.76 | $676.00 |
| 500 | $6.08 | $3,040.00 |
| 1,000 | $5.41 | $5,410.00 |
PIC18F442T-I/PT Overview
What is a PIC18F microcontroller? The PIC18F family is Microchip's enhanced 8-bit RISC architecture, succeeding the PIC16 mid-range line with a 16-bit instruction word, hardware multiplier, linear memory map, and C-friendly compiler support. The PIC18F442 specifically targets 40/44-pin applications needing on-chip 10-bit ADC, multiple timers, and USB-/CAN-free general-purpose connectivity at industrial temperature ranges. It belongs to the broader category of microcontrollers (MCU) -> embedded controllers -> integrated circuits -> semiconductors.
Key differentiating features include 16KB self-programmable flash, 10-bit ADC up to 8 channels, two analog comparators, a USART with LIN support, MSSP (SPI/I2C), two capture/compare/PWM modules, and nanoWatt Technology for low-power sleep modes drawing under 1 uA. The 40 MHz oscillator provides 10 MIPS throughput, while 77 single-word instructions simplify assembly programming and reduce code footprint.
The architecture is a Harvard-style RISC core with separate program and data buses, 31-level hardware stack, and an 8x8 hardware multiplier for efficient arithmetic operations. It is fully upwards compatible with PIC16C5X, PIC16CXX, PIC17CXX, and PIC12CXXX source code, enabling seamless code migration from legacy Microchip designs.
Typical applications include industrial control panels, HVAC actuator controllers, automotive body electronics, sensor signal conditioning nodes, low-end consumer appliances, and educational embedded kits. The 44-TQFP package is suitable for compact PCB layouts that need a high pin count without exceeding 1 square inch of board area.
When designing with this MCU, reserve at least one analog pin for VREF+ if ADC accuracy matters, and pair the internal 8 MHz RC oscillator with the PLL only if peripheral timing tolerates up to +/- 2% jitter. In-system programming via ICSP requires RB6/RB7 to remain dedicated.
This page synthesizes distributor pricing, parametric cross-references, and engineering design notes that complement - but do not replace - the manufacturer datasheet (DS39564 family).
Drop-in alternatives for PIC18F442T-I/PT — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC18F442T-I/PT (same form factor and footprint) — differing in Package, Operating Temperature, ADC, Timers, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F442T-E/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F4420T-I/PT
✅ Drop-In✓ In Stock
$2.8098 / Unit
View Datasheet →PIC18F452T-I/PT
✅ Drop-In✓ In Stock
$5 / Unit
View Datasheet →PIC18F442T-I/PT
✅ Drop-In✓ In Stock
$5.41 / Unit
View Datasheet →PIC18F4423T-I/PT
✅ Drop-In✓ In Stock
$1.97 / Unit
View Datasheet →PIC18F4410T-I/PT
✅ Drop-In✓ In Stock
$4.51 / Unit
View Datasheet →PIC18F43K22T-I/PT
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →PIC18F4320T-I/PT
✅ Drop-In✓ In Stock
$3.1 / Unit
View Datasheet →PIC18F442T-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18F 8-bit RISC |
| Program Memory (Flash) | 16 KB (8K x 16) |
| RAM | 768 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Instruction Execution Time | 100 ns |
| Supply Voltage (VDD) | 4.2 V to 5.5 V |
| I/O Pins | 34 |
| ADC | 10-bit, up to 8 channels |
| Timers | 4 (Timer0/1/2/3) |
| CCP Modules | 2 |
| USART | 1 with LIN support |
| MSSP (SPI / I2C) | 1 |
| Comparators | 2 analog |
| Package | 44-pin TQFP (10x10 mm), Tape & Reel |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
PIC18F442T-I/PT Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear (Reset) input / Programming voltage |
| Pin 2 | RA0/AN0 — Digital I/O / Analog input channel 0 |
| Pin 3 | RA1/AN1 — Digital I/O / Analog input channel 1 |
| Pin 4 | RA2/AN2/VREF- — Digital I/O / Analog input channel 2 / ADC VREF- |
| Pin 5 | RA3/AN3/VREF+ — Digital I/O / Analog input channel 3 / ADC VREF+ |
| Pin 6 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — Digital I/O / Analog input channel 4 / SPI Slave Select |
| Pin 8 | RE0/RD/AN5 — Digital I/O / Parallel Port read control / Analog input channel 5 |
| Pin 9 | RE1/WR/AN6 — Digital I/O / Parallel Port write control / Analog input channel 6 |
| Pin 10 | RE2/CS/AN7 — Digital I/O / Parallel Port chip select / Analog input channel 7 |
| Pin 11 | VDD — Positive supply voltage (4.2V to 5.5V) |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC1/CLKI/RA7 — Oscillator input / External clock input / Digital I/O |
| Pin 14 | OSC2/CLKO/RA6 — Oscillator output / Clock output / Digital I/O |
| Pin 15 | RC0/T1OSO/T1CKI — Digital I/O / Timer1 oscillator output / Timer1 clock input |
| Pin 16 | RC1/T1OSI/CCP2 — Digital I/O / Timer1 oscillator input / CCP2 output |
| Pin 17 | RC2/CCP1 — Digital I/O / CCP1 PWM output |
| Pin 18 | RC3/SCK/SCL — Digital I/O / SPI clock / I2C clock |
| Pin 19 | RC4/SDI/SDA — Digital I/O / SPI data in / I2C data |
| Pin 20 | RC5/SDO — Digital I/O / SPI data out |
| Pin 21 | RC6/TX/CK — Digital I/O / USART async transmit / USART sync clock |
| Pin 22 | RC7/RX/DT — Digital I/O / USART async receive / USART sync data |
| Pin 23 | RD0/PSP0 — Digital I/O / Parallel Slave Port bit 0 |
| Pin 24 | RD1/PSP1 — Digital I/O / Parallel Slave Port bit 1 |
| Pin 25 | RD2/PSP2 — Digital I/O / Parallel Slave Port bit 2 |
| Pin 26 | RD3/PSP3 — Digital I/O / Parallel Slave Port bit 3 |
| Pin 27 | RD4/PSP4 — Digital I/O / Parallel Slave Port bit 4 |
| Pin 28 | RD5/PSP5 — Digital I/O / Parallel Slave Port bit 5 |
| Pin 29 | RD6/PSP6 — Digital I/O / Parallel Slave Port bit 6 |
| Pin 30 | RD7/PSP7 — Digital I/O / Parallel Slave Port bit 7 |
| Pin 31 | VSS — Ground reference |
| Pin 32 | VDD — Positive supply voltage (4.2V to 5.5V) |
| Pin 33 | RB0/INT0 — Digital I/O / External interrupt 0 |
| Pin 34 | RB1/INT1 — Digital I/O / External interrupt 1 |
| Pin 35 | RB2/INT2 — Digital I/O / External interrupt 2 |
| Pin 36 | RB3/INT3/CCP2 — Digital I/O / External interrupt 3 / CCP2 output |
| Pin 37 | RB4 — Digital I/O / Interrupt-on-change |
| Pin 38 | RB5 — Digital I/O / Interrupt-on-change |
| Pin 39 | RB6/PGC — Digital I/O / ICSP clock (programming) |
| Pin 40 | RB7/PGD — Digital I/O / ICSP data (programming) |
| Pin 41 | NC — Not connected (per datasheet) |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
Typical Applications
PIC18F442T-I/PT is suitable for 6 applications: Industrial Control Panels, HVAC Actuator Controllers, Automotive Body Electronics, Sensor Signal Conditioning Nodes, Consumer Appliance Control Boards, Educational Embedded Development Kits.
Industrial Control Panels
The PIC18F442T-I/PT suits industrial control panels with its 34 digital I/O pins, 16KB flash, and -40C to +85C industrial temperature range. Its 40 MHz core delivers 10 MIPS throughput for scan-loop PLC logic and HMI keypad/LED multiplexing. The 10-bit ADC with 8 channels reads panel-mount sensors (pressure, temperature, flow) at typical 10 kS/s conversion rates. nanoWatt sleep modes drop current below 1 uA between operator interactions, extending backup-battery life for unattended monitoring. The 44-TQFP package fits 4-layer panels alongside isolated RS-485 transceivers driven by the USART, while ICSP on RB6/RB7 enables in-the-field firmware updates without dismantling enclosures.
Recommended
HVAC Actuator Controllers
HVAC damper and valve actuators benefit from the PIC18F442T-I/PT's two CCP modules driving PWM outputs at up to 40 MHz resolution for proportional valve control. The 16KB flash holds firmware for PID loop control, anti-seize cycling routines, and Modbus RTU slave protocols over the USART. The 10-bit ADC samples supply voltage, motor current, and position feedback with 8 channels per scan cycle. nanoWatt Technology reduces standby draw to under 1 uA during seasonal idle periods, and the 44-TQFP package withstands -40C to +85C industrial operating temperatures in unconditioned mechanical rooms.
Recommended
Automotive Body Electronics
The PIC18F442T-I/PT's 34 I/O pins and LIN-capable USART make it a fit for automotive body modules (window controllers, seat adjusters, mirror positioners). Operating from 4.2V to 5.5V with industrial-grade temperature tolerance handles under-hood thermal stress up to +85C. The 10-bit ADC monitors motor current for stall detection and load-dump events, while the two CCP modules drive PWM at 1 kHz to 20 kHz for brushed DC motor speed control. The 44-TQFP SMT package withstands automotive vibration profiles when paired with proper underbody potting, and nanoWatt sleep draws less than 1 uA during parking-mode standby to protect 12V battery state-of-charge.
Recommended
Sensor Signal Conditioning Nodes
Distributed sensor nodes (for process plants, agricultural monitoring, environmental sensing) use the PIC18F442T-I/PT for analog front-end processing and digital aggregation. Its 10-bit ADC with 8 channels multiplexes thermocouples, RTDs, strain gauges, and 4-20 mA loops at 10 kS/s, while the MSSP module drives SPI ADCs for higher-precision channels. The 16KB flash holds linearization curves, digital filters, and SDI-12 or Modbus slave protocols. Sleep current under 1 uA via nanoWatt Technology enables 5+ year battery life on 3.6V lithium packs, and the 44-TQFP footprint integrates cleanly into IP67 enclosures alongside TVS protection.
Recommended
Consumer Appliance Control Boards
Mid-range consumer appliances (coffee machines, induction cooktops, washing machines, microwave ovens) use the PIC18F442T-I/PT for cost-effective user-interface and motor control. Its 16KB flash runs capacitive-touch firmware, 7-segment LED drivers, and small RTOS task schedulers. The 40 MHz core executes menu state machines and safety interlock checks in under 100 ns. The 34 I/O lines handle keypad scanning, relay drivers, triac control via zero-cross detection, and PWM for universal motor speed control. nanoWatt Technology keeps standby power below 1 W to meet ENERGY STAR idle limits, and the 44-TQFP package simplifies automated SMT assembly on consumer-production lines.
Recommended
Educational Embedded Development Kits
The PIC18F442T-I/PT powers hobbyist and university curricula because of its 77 single-word instruction set and 100 ns execution time. 16KB flash fits introductory C and assembly projects (state machines, interrupt handlers, peripheral libraries), while 768 bytes RAM and 256 bytes EEPROM support small data tables and persistent settings. The 34 I/O pins map cleanly to common lab peripherals: 7-segment displays, character LCDs, keypads, servo motors, and UART-connected sensors. ICSP via RB6/RB7 enables on-board programming without chip removal, and the 44-TQFP package matches standard 0.1-inch-pitch breakout boards (e.g., TQFP-to-DIP adapters) for breadboarding exercises.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F442T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F442T-E/PT | PIC18F4420T-I/PT | PIC18F452T-I/PT | PIC18F4423T-I/PT | PIC18F4410T-I/PT | PIC18F43K22T-I/PT | PIC18F4320T-I/PT |
|---|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-TQFP (PT) 10x10 mm | 44-TQFP (PT) 10x10 mm | 44-TQFP (PT) 10x10 mm | 44-TQFP (PT) 10x10 mm | 44-TQFP (PT) 10x10 mm | 44-TQFP (PT) 10x10 mm | 44-TQFP (PT) 10x10 mm | 44-TQFP (PT) 10x10 mm |
| Program Memory (Flash) | 16 KB | 16 KB | 16 KB | 32 KB (+100%) | 16 KB | 16 KB | 8 KB (-50%) | 8 KB (-50%) |
| RAM | 768 bytes | 768 bytes | 768 bytes | 1536 bytes (+100%) | 768 bytes | 768 bytes | 512 bytes (-33%) | 256 bytes (-67%) |
| Maximum Clock Speed | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 64 MHz (+60%) | 40 MHz |
| ADC Resolution | 10-bit | 10-bit | 10-bit | 10-bit | 12-bit (+20%) | 10-bit | 10-bit | 10-bit |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +125C (Extended) | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Supply Voltage | 4.2V to 5.5V | 4.2V to 5.5V | 4.2V to 5.5V | 4.2V to 5.5V | 4.2V to 5.5V | 4.2V to 5.5V | 1.8V to 5.5V (wider) | 4.2V to 5.5V |
Key Differentiators
- Drop-in upgrade path with 2x flash and 2x RAM (vs PIC18F452T-I/PT)
- 12-bit ADC upgrade on identical footprint (vs PIC18F4423T-I/PT)
- Extended temperature grade in same package (vs PIC18F442T-E/PT)
- NanoWatt XLP low-power alternative available (vs PIC18F43K22T-I/PT)
Design Notes
The PIC18F442T-I/PT requires a 4.2V to 5.5V regulated VDD supply; brown-out is detected below 4.0V per the DS39564C electrical characteristics. Place a 100 nF ceramic decoupling capacitor within 5 mm of each VDD/VSS pin pair (pins 11/12 and 31/32), and add a bulk 10 uF tantalum at the regulator output to suppress motor-induced transients. For battery-powered designs, gate the VDD with a P-channel MOSFET controlled by a separate low-leakage rail to achieve <1 uA sleep current with nanoWatt Technology.
Do not reassign RB6 and RB7 (pins 39/40) to general-purpose I/O unless ICSP is permanently disabled, because Microchip's ICSP protocol requires exclusive access during programming. The 4.2V minimum supply excludes operation from standard 3.3V rails; for 3.3V systems choose PIC18LF442T-I/PT or PIC18F45K22T-I/PT. ADC accuracy degrades if source impedance exceeds 2.5 kohm; add an op-amp buffer or increase acquisition time. The internal 8 MHz RC oscillator carries +/- 2% tolerance over temperature - switch to a crystal for UART, USB, or CAN timing-sensitive applications.
Route the 44-TQFP footprint on a 4-layer PCB with a continuous ground plane directly beneath the package; this shields the oscillator traces from switching noise on adjacent digital lines. Keep crystal traces (OSC1/OSC2) shorter than 10 mm and surround them with a ground guard ring tied to the analog ground. Place C1/C2 load capacitors within 3 mm of the OSC pins with trace stubs under 2 mm. Maintain a 0.2 mm solder mask dam between TQFP leads and the thermal pad, and use NSMD land patterns for improved lead compliance during thermal cycling.
Estimated: At maximum activity (40 MHz CPU + ADC + all peripherals on) the PIC18F442T-I/PT dissipates approximately 70 mW internally. With the 44-TQFP's typical theta_JA of 50 C/W on a 4-layer 1oz board, the junction temperature rises 3.5 C above ambient - well within the 150 C absolute maximum. At extended temperature (125 C ambient) ensure the heat-sinking copper pour covers at least 50% of the package underside and that the device does not share the board with >2 W power components that lack thermal relief.
Compliance Information
RoHS-compliant lead-free TQFP package. PIC18F442T-I/PT is not AEC-Q100 qualified; for automotive AEC-Q100 designs choose PIC18F-K42 family.
